<template>
  <el-breadcrumb class="flex-y-center">
    <transition-group enter-active-class="animate__animated animate__fadeInRight">
      <el-breadcrumb-item v-for="(item, index) in breadcrumbs" :key="item.path">
        <span v-if="
            item.redirect === 'noredirect' || index === breadcrumbs.length - 1
          " class="color-gray-400">{{ translateRouteTitle(item.meta.title) }}</span>
        <a v-else @click.prevent="handleLink(item)">
          {{ translateRouteTitle(item.meta.title) }}
        </a>
      </el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script setup lang="ts">
  import { RouteLocationMatched } from "vue-router";
  import { compile } from "path-to-regexp";
  import router from "@/router";
  import { translateRouteTitle } from "@/utils/i18n";

  const currentRoute = useRoute();
  const pathCompile = (path: string) => {
    const { params } = currentRoute;
    const toPath = compile(path);
    return toPath(params);
  };

  const breadcrumbs = ref < Array < RouteLocationMatched >> ([]);

  function getBreadcrumb() {
    let matched = currentRoute.matched.filter(
      (item) => item.meta && item.meta.title
    );
    const first = matched[0];
    if (!isDashboard(first)) {
      matched = [
        { path: "/dashboard", meta: { title: "dashboard" } } as any,
      ].concat(matched);
    }
    breadcrumbs.value = matched.filter((item) => {
      return item.meta && item.meta.title && item.meta.breadcrumb !== false;
    });
  }

  function isDashboard(route: RouteLocationMatched) {
    const name = route && route.name;
    if (!name) {
      return false;
    }
    return (
      name.toString().trim().toLocaleLowerCase() ===
      "Dashboard".toLocaleLowerCase()
    );
  }

  function handleLink(item: any) {
    const { redirect, path } = item;
    if (redirect) {
      router.push(redirect).catch((err) => {
        console.warn(err);
      });
      return;
    }
    router.push(pathCompile(path)).catch((err) => {
      console.warn(err);
    });
  }

  watch(
    () => currentRoute.path,
    (path) => {
      if (path.startsWith("/redirect/")) {
        return;
      }
      getBreadcrumb();
    }
  );

  onBeforeMount(() => {
    getBreadcrumb();
  });
</script>

<style lang="scss" scoped>
  // 覆盖 element-plus 的样式
  .el-breadcrumb__inner,
  .el-breadcrumb__inner a {
    font-weight: 400 !important;
  }
</style>